Run this test once, and VCR will record the http request to fixtures/vcr_cassettes/synopsis.yml. Run it again, and VCR
will replay the response from example.com when the http request is made. This test is now fast (no real HTTP requests are
made anymore), deterministic (the test will continue to pass, even if you are offline, or example.com goes down for
maintenance) and accurate (the response from example.com will contain the same headers and body you get from a real request).